Antiferromagnetic fluctuations and gradual breakdown of the Fermi liquid*

The Kadowaki-Woods ratio can be used to probe the electron correlations in metals that can be described by Fermi liquid theory [1]. It is possible to formulate this ratio in terms of the quasiparticle renormalization Z_k and the Fermi liquid cutoff frequency ω_c [2]. Here, we use the two-particle self-consistent approach to study theoretically the effect of antiferromagnetic fluctuations on the Fermi liquid in the electron-doped cuprate NCCO. More precisely, we show the effect of electron correlations on the cutoff frequency and the Kadowaki-Woods-like ratio between Z_k and ω_c. We also investigate the effect of antiferromagnetic fluctuations at two dopings right above and below the antiferromagnetic quantum critical point, as well as in the strongly overdoped region, where we recover the expected Fermi liquid behaviour. We find a gradual and anisotropic breakdown of the quasiparticles along the Fermi surface, analogous to what was observed previously in LSCO [3].

[1] Jacko et al, Nature Physics (2009)
[2] Horio et al, arXiv:2006.13119 (2020)
[3] Chang et al, Nature Communications (2013)